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Highly Available Hypercube Tokenized Sequential Matrix Partitioned Data Sharing in Large P2P Networks
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作者 C. G. Ravichandran J. Lourdu Xavier 《Circuits and Systems》 2016年第9期2109-2119,共11页
Peer-to-peer (P2P) networking is a distributed architecture that partitions tasks or data between peer nodes. In this paper, an efficient Hypercube Sequential Matrix Partition (HS-MP) for efficient data sharing in P2P... Peer-to-peer (P2P) networking is a distributed architecture that partitions tasks or data between peer nodes. In this paper, an efficient Hypercube Sequential Matrix Partition (HS-MP) for efficient data sharing in P2P Networks using tokenizer method is proposed to resolve the problems of the larger P2P networks. The availability of data is first measured by the tokenizer using Dynamic Hypercube Organization. By applying Dynamic Hypercube Organization, that efficiently coordinates and assists the peers in P2P network ensuring data availability at many locations. Each data in peer is then assigned with valid ID by the tokenizer using Sequential Self-Organizing (SSO) ID generation model. This ensures data sharing with other nodes in large P2P network at minimum time interval which is obtained through proximity of data availability. To validate the framework HS-MP, the performance is evaluated using traffic traces collected from data sharing applications. Simulations conducting using Network simulator-2 show that the proposed framework outperforms the conventional streaming models. The performance of the proposed system is analyzed using energy consumption, average latency and average data availability rate with respect to the number of peer nodes, data size, amount of data shared and execution time. The proposed method reduces the energy consumption 43.35% to transpose traffic, 35.29% to bitrev traffic and 25% to bitcomp traffic patterns. 展开更多
关键词 peer-to-peer (p2p) video-on-demand HYpERCUBE Sequential Matrix partition Data Mapping Data Availability
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Is playing-as-downloading feasible in an eMule P2P file sharing system?
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作者 Wen-yi WANG Yao-wu CHEN 《Journal of Zhejiang University-Science C(Computers and Electronics)》 SCIE EI 2010年第6期465-475,共11页
Peer-to-peer(P2P) swarm technologies have been shown to be very efficient for large scale content distribution systems, such as the well-known BitTorrent and eMule applications.However, these systems have been designe... Peer-to-peer(P2P) swarm technologies have been shown to be very efficient for large scale content distribution systems, such as the well-known BitTorrent and eMule applications.However, these systems have been designed for generic file sharing with little consideration of media streaming support, and the user cannot start a movie playback before it is completely downloaded.The playing-as-downloading capability would be particularly useful for a downloading peer to evaluate if a movie is valuable to be downloaded, and it could also help the P2P content distribution system to locate and eliminate the polluted contents.In this paper we address this issue by introducing a new algorithm, wish driven chunk distribution(WDCD), which enables the P2P file sharing system to support the video-on-demand(VOD) function while keeping the P2P native downloading speed.A new parameter named next-play-frequency is added to the content chunk to strike a replication balance between downloading and streaming requests.We modify the eMule as the test bed by adding the WDCD algorithm and then verify the prototype implementation by experiments.The experimental results show that the proposed algorithm can keep the high downloading throughput performance of the eMule system with a good playing-as-downloading function. 展开更多
关键词 peer-to-peer(p2p) video-on-demand(VOD) playing-as-downloading EMULE
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基于p^2-不变量的透视变换下的点模式匹配方法 被引量:2
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作者 张立华 徐文立 《中国图象图形学报(A辑)》 CSCD 2000年第11期948-952,共5页
点模式匹配是计算机视觉和模式识别领域中的一个重要问题 .通过研究 ,在假定待匹配的两个点模式中已知有三对点整体对应的前提下 ,基于射影坐标以及对投影变换和排序变换同时保持不变的 p2 -不变量等理论 ,通过定义一种广义距离 ,给出... 点模式匹配是计算机视觉和模式识别领域中的一个重要问题 .通过研究 ,在假定待匹配的两个点模式中已知有三对点整体对应的前提下 ,基于射影坐标以及对投影变换和排序变换同时保持不变的 p2 -不变量等理论 ,通过定义一种广义距离 ,给出了一种求解透视变换下 ,点数不等的两个平面点模式匹配问题的新算法 .理论分析和仿真实验表明 ,该算法是快速。 展开更多
关键词 点模式匹配 透视变换 p^2--不变量 计算机视觉
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浅谈农村远程教育体系的构建
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作者 陆秀艳 《湖南广播电视大学学报》 2007年第3期27-28,共2页
本文通过分析目前我国农村远程教育现状和人才发展现状,从农村教育硬件资源、软件资源、教师资源等五个角度提出我国目前应如何构建科学的农村远程教育体系,培养实用型的农村人才。
关键词 农村远程教育 资源 体系 实用型农村人才
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表面等离子体无掩膜干涉光刻系统的数值分析(英文) 被引量:5
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作者 董启明 郭小伟 《光子学报》 EI CAS CSCD 北大核心 2012年第5期558-564,共7页
表面等离子体激元具有近场增强效应,可以代替光子作为曝光源形成纳米级特征尺寸的图像.本文数值分析了棱镜辅助表面等离子体干涉系统的参量空间,并给出了计算原理和方法.结果表明,适当地选择高折射率棱镜、低银层厚度、入射波长和光刻... 表面等离子体激元具有近场增强效应,可以代替光子作为曝光源形成纳米级特征尺寸的图像.本文数值分析了棱镜辅助表面等离子体干涉系统的参量空间,并给出了计算原理和方法.结果表明,适当地选择高折射率棱镜、低银层厚度、入射波长和光刻胶折射率,可以获得高曝光度、高对比度的干涉图像.入射波长为431nm时,选择40nm厚的银层,曝光深度可达200nm,条纹周期为110nm.数值分析结果为实验的安排提供了理论支持. 展开更多
关键词 干涉光刻 表面等离子体激元 克莱舒曼结构
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